So what are you trying to achieve by reducing the population, less resource use? Often these sorts of things are aimed at 3rd world population (and admittedly some countries, such as Ethopia are beyond their carrying capacity). The problem with this argument is people in those countries use the least resources, sometimes 10-20 times or more less resources than Westerners.
The people who use the most resources are those that tend to live in sprawling suburbs, often in arid areas, have 2-3 cars per household and are frequent flyers. They live in large homes, that require a lot of heating and water, and often consume the most food, especially red meats. For example, those that live in southern part of the United States.
In the UK, it tends to be middle class, middle age people. Again who have several cars, take frequent holidays and buy a lot of consumer goods. This group yield the most monetary and political power, and turkeys don't vote for Christmas!
In Western countries, we tend to have very low population growth, even taking immigration into account. A better educated population tends to have less children, as they do not need to support themselves on the land.
The principal problem is there are an ever burgeoning older population that is often not economically active and requires the most government resources - especially health. This needs to be supported by a much younger working population, which is not growing fast enough to support the elderly.
The other problem with all these population/resource issues, is it's always somebody else's population that needs to be reduced, and people do not see themselves as a problem. Nor do they see a problem with unbridled consumption of goods and services, in fact they often construct an argument population should be reduced so they can continue their ways indefinitely and the poor (who consume far less, home and abroad) should suffer. It really does get as low key as car ownership versus giving birth.
The whole issue of carrying capacity is hotly debated, and many issues are counter intuitive. For example, people in cities tend to consume less resources (directly and indirectly) than those in country areas, yet often the idea is pushed that it's the cities that are unsustainable.
It's not that exponential growth is not a problem, it is, but how to take it is a very difficult thing to approach morally, economically and politically. Politicians and Economists typically rely on technology and education for fixes. The question is, will there be enough technological breakthroughs in time to avert disaster, and will the natural birthrate continue to decline enough to stabilise the population versus supporting an elderly population.
http://www.youtube.com/watch?v=F-QA2rkpBSY
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And probably longer...
We really are screwed as a generation aren't we...
The Baby Boomers (those born 1945-1965) probably had it the best in general, it's becoming pretty evident that the generations that follow will be retiring later, will have to work harder, pay more for the basics, especially housing, and social mobility has pretty much stopped - although of course in some ways it's relative, and today's poor are comparatively rich by 1950s standards. Quite a few books have been written on the subject including:
http://www.amazon.co.uk/Jilted-Generation-Britain-Bankrupted-Youth/dp/1848311982/ref=pd_sim_b_1
http://www.amazon.co.uk/Pinch-Boomers-Childrens-Future-Should/dp/1848872321/ref=pd_sim_b_2
http://www.amazon.co.uk/What-did-baby-boomers-ever/dp/1849540268/ref=pd_sim_b_1